Raman scattering from the vibrational modes in Zn1-xMnxTe

We report the observation of Raman scattering associated with the vibrational modes in the diluted magnetic semiconductor Zn1-xMnxTe. The low-frequency two-phonon density-of-states features in Zn1-xMnxTe, similar to those of ZnTe, exhibit composition-dependent Raman shifts. Low-frequency disorder-induced one-phonon density-of-states features are also present in the Raman spectra for x0.10. The optical phonons of Zn1-xMnxTe exhibit a variation with x that is intermediate between the two-mode and one-mode situations. The optical modes of Zn1-xMnxTe are compared with those of Cd1-xMnxTe, the prototype of wide-band-gap diluted magnetic semiconductors. A random-element isodisplacement model is used to describe the behavior of the optical phonons of both alloy systems.